{"product_id":"12ax7-ecc83-telefunken-tested-tube-ribbed-plates-diamond-bottom-made-in-germany","title":"12AX7 \/ ECC83 TELEFUNKEN Tested Tube – Ribbed Plates Diamond Bottom Made in Germany","description":"\u003cp\u003e \u003cstrong\u003e12AX7 ( ECC83 ) TELEFUNKEN\u003cmeta charset=\"utf-8\"\u003e Tested Tube - Ribbed Plates Diamond \u0026lt;\u0026gt; Bottom Made in Germany '60s\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp data-end=\"711\" data-start=\"0\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eThe\u003c\/span\u003e \u003cstrong data-end=\"340\" data-start=\"320\"\u003e12AX7 TELEFUNKEN\u003c\/strong\u003e \u003cspan\u003e, in the prestigious\u003c\/span\u003e \u003cstrong data-end=\"429\" data-start=\"369\"\u003eRibbed Plates version with the diamond logo \u0026lt;\u0026gt; engraved on the bottom\u003c\/strong\u003e \u003cspan\u003e, represents one of the most refined and sought-after expressions in the history of European valve production.\u003c\/span\u003e \u003cbr data-end=\"542\" data-start=\"539\"\u003e\u003cspan\u003eThis valve head\u003c\/span\u003e \u003cstrong data-end=\"571\" data-start=\"556\"\u003e,\u003c\/strong\u003e \u003cspan\u003eproduced in\u003c\/span\u003e \u003cstrong data-end=\"618\" data-start=\"585\"\u003eGermany in the 60s\u003c\/strong\u003e \u003cspan\u003e, is distinguished by an extremely\u003c\/span\u003e \u003cstrong data-end=\"687\" data-start=\"659\"\u003eclean, neutral and stable\u003c\/strong\u003e sound \u003cspan\u003e, which makes it an absolute reference for top-level hi-fi applications, recording studios and professional audio equipment.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch3 data-end=\"741\" data-start=\"713\"\u003e \u003cstrong data-end=\"741\" data-start=\"715\"\u003eSound Characteristics\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp data-end=\"1010\" data-start=\"743\"\u003e \u003cstrong data-end=\"752\" data-start=\"743\"\u003eBass:\u003c\/strong\u003e The low range is \u003cstrong data-end=\"813\" data-start=\"772\"\u003edry, precise, and very controlled\u003c\/strong\u003e . There is no artificial emphasis: the bass is uncluttered, fast, and legible, contributing to a solid, stable foundation, particularly suited to systems that prioritize clarity and articulation.\u003c\/p\u003e\n\n \u003cp data-end=\"1331\" data-start=\"1012\"\u003e\u003cstrong data-end=\"1020\" data-start=\"1012\"\u003eMids:\u003c\/strong\u003e The strong point of this design. The mids are \u003cstrong data-end=\"1124\" data-start=\"1076\"\u003eextremely linear, transparent, and neutral\u003c\/strong\u003e , with vocals faithfully reproduced to their original timbre. Acoustic instruments emerge with great clarity and lack of coloration, making this tube ideal for high-resolution systems.\u003c\/p\u003e\n\n\u003cp data-end=\"1558\" data-start=\"1333\"\u003e \u003cstrong data-end=\"1341\" data-start=\"1333\"\u003eHighs:\u003c\/strong\u003e Clean, extended, and finely refined. The high end is \u003cstrong data-end=\"1430\" data-start=\"1398\"\u003eairy yet controlled\u003c\/strong\u003e , with a very fine grain and no harshness. Listening is open and stable, without fatigue even over long periods.\u003c\/p\u003e\n\n \u003cp data-end=\"1779\" data-start=\"1560\"\u003e\u003cstrong data-end=\"1572\" data-start=\"1560\"\u003eDynamics:\u003c\/strong\u003e Measured and coherent. The response prioritizes \u003cstrong data-end=\"1639\" data-start=\"1622\"\u003emicrodynamics\u003c\/strong\u003e and the continuity of the musical message, avoiding any dramatic effects. Transients are rendered with precision and naturalness.\u003c\/p\u003e\n\n\u003cp data-end=\"1979\" data-start=\"1781\"\u003e \u003cstrong data-end=\"1795\" data-start=\"1781\"\u003eSoundstage:\u003c\/strong\u003e The soundstage is \u003cstrong data-end=\"1855\" data-start=\"1816\"\u003etidy, stable, and well-focused\u003c\/strong\u003e . The separation of planes is clear, with believable depth and a rational imaging, typical of the Telefunken approach.\u003c\/p\u003e\n\n\u003ch3 data-end=\"2281\" data-start=\"1981\"\u003e \u003cstrong\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp data-end=\"2281\" data-start=\"1981\"\u003e Ideal for preamplifiers and input stages of hi-fi systems that require \u003cstrong data-end=\"2147\" data-start=\"2097\"\u003eneutrality, transparency, and tonal accuracy\u003c\/strong\u003e . Particularly suitable for already balanced systems, where you want to preserve signal fidelity without introducing coloration.\u003c\/p\u003e\n\n\u003ch3 data-end=\"2560\" data-start=\"2283\"\u003e \u003cstrong\u003e🎸 Use in Music Applications\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n \u003cp data-end=\"2560\" data-start=\"2283\"\u003eThey are also popular in instrument amplifiers and studio equipment, especially where \u003cstrong data-end=\"2482\" data-start=\"2430\"\u003edefinition, quietness, and predictable response\u003c\/strong\u003e are required. They offer a clean, controlled sound with great detail readability.\u003c\/p\u003e\n\n\u003ch3 data-end=\"3066\" data-start=\"2562\"\u003e \u003cstrong\u003e🎯 Note for audiophiles\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"3066\" data-start=\"2562\"\u003e This \u003cstrong data-end=\"2666\" data-start=\"2607\"\u003e12AX7 \/ ECC83 TELEFUNKEN Ribbed Plates – Diamond Bottom\u003c\/strong\u003e is intended for the experienced audiophile who appreciates a \u003cstrong data-end=\"2762\" data-start=\"2727\"\u003etechnical, balanced and rigorous\u003c\/strong\u003e approach.\u003cbr data-end=\"2766\" data-start=\"2763\"\u003e Selection and testing ensure stability and operational consistency. An \u003cstrong data-end=\"2953\" data-start=\"2906\"\u003ehonest, defensible, and musically correct\u003c\/strong\u003e proposition, in line with the \u003cstrong data-end=\"3007\" data-start=\"2981\"\u003eVacuum Tubes Treasures\u003c\/strong\u003e philosophy: the valve as an instrument of fidelity, not as an artifice.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eTest Results\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e \u003cstrong\u003eTested on AMPLITREX AT-1000 Tube Tester\u003c\/strong\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cstrong\u003eVoltage Test:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVa = 250V, Vg = -2V \u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eGm = 1600 ; Ia = 1.2 mA \u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eSTRONG\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1\u003c\/strong\u003e : Gm = 1300; Ia = 0.8 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Gm = 1400; Ia = 0.8 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low Noise \u0026amp; Microphonics – Tested and compliant for use in hi-fi systems and guitar amplifiers.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections are coherent and well aligned, making the valve also suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Strong and stable output, no fluctuations.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e \u003cspan\u003eFair – All writing has disappeared. Small imperfection on the glass. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e None – Made by TELEFUNKEN, identifiable by its construction features. 1960s\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003ca rel=\"noopener\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"TELEFUNKEN","offers":[{"title":"Default Title","offer_id":56993063633244,"sku":"03468","price":237000.0,"currency_code":"KRW","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_84091733-925f-4233-a0b9-ad353e13c9f9.jpg?v=1773420136","url":"https:\/\/vacuumtubestreasures.com\/en-kr\/products\/12ax7-ecc83-telefunken-tested-tube-ribbed-plates-diamond-bottom-made-in-germany","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}